Waltee scott



(No Model.)

' W. SCOTT. Cushioning Devioe'for Printing'Presses.

No. 238,720. Patented March 8,1881.

NJFETERS, PuoTo-LITHOGRAPMER, WASHINGTON, D C.

UNITED STATES PATENT OFFICE.

WALTER SCOTT, OF PLAINFIELD, NEW JERSEY.

CUSHIONING DEVICE FOR PRINTING-PRESSES.

SPECIFICATION 'forming part of Letters Patent No. 238,720, dated March8, 1881.

Application filed January 8, 1881. (No model.)

T 0 all whom it may concern Be it known that I, WVALTER SCOTT, ofPlainfield, in the county of Union and State of New Jersey, haveinvented an Improvement in Cushioning Devices for Printing-Presses, ofwhich the following is a specification.

In printing-presses having a reciprocating bed there have been cylindersupon the bed passing upon pistons that are stationary upon the frame,and the confined air has acted as a cushion to stop the momentum of thebed and lessen the concussion or strain in changing the direction ofmotion of the bed. In presses of this kind cocks have been provided thatregulate the escape of air, so as to confine more or less air, accordingto the speed of the press. These cocks are usually adjusted by hand; butin some instances a governor has been combined with them. In printing,the press is often stopped and the, bed moved by hand very slowly inadjusting the parts. If this is done with the cocks partially orentirely closed, the accumulated atmospheric pressure prevents the pressbeing moved at the end of the stroke, and the attendant has to go to thecocks and open them to complete the movement of the press by hand. Thisis a loss of time, and objectionable. Furthermore, if the press isstarted by power, it sometimes moves slowly, and the cushioning is toomuch and checks the movement of the bed.

The nature of my invention consists in combining with the cocks of thecushioning device a connection to the belt-shifting mechanism, so thatwhen the belt is shifted to stop the press the cocks are opened, and thecushioning apparatus does not interfere with the movement of the pressby hand, and in starting by power the cocks are closed gradually as thebelt'is shifted and the parts begin to move.

In the drawings, Figure 1 is a plan view, showing the manner ofconnecting the beltshifter and the rods to the air-cocks; and Fig. 2 isa vertical section, showing the bed of the press and the cushioningdevices.

The frame a of the press is of ordinary character, and the bed b isreciprocatcd upon its ways as usual.

The cylinders 0 upon the under side of the bed, the pistons 61,supported by the frame a, and the air-cocks e, are of usual character,and their operation is well known.

The belt-shifterfis operated by a lever, g, or other convenient device,and between the belt-shifterfand the cocks e there are suitableconnecting devices, so that when the belt-shifter is moved to stop thepress the air-cocks are opened. A convenient device for this purpose isa rod, Z, attached to each cock, with a crankarm, 71., upon it, andconnected by a link, 0, to a lever, r, the other end of which isconnected with the belt-shifter f, so that as the beltshifter is moved.endwise the cocks will be opened as the press is stopped, and closed asthepress is started again, thus rendering it unnecessary to manipulatethe cooks by hand.

Each cock may be provided With an adjustable stop, so that on startingthe press the cooks will be closed to a given point, either partially orentirely.

The peculiar shape and positions of the mechanism connecting theaircocks to the belt-shifter will vary according to the construction ofthe press.

I claim as my invention- The combination, with the cushioning-cylindersand pistons in a printing-press and their air-cocks, of connectingdevices between said air-cocks and the belt-shifting mechanism, wherebythe air-cocks are opened by the mechanism that stops the press andclosed or partially closed in starting the press, substantially as setforth.

Signed by me this 30th day of December, A. D. 1880.

WALTER SCOTT.

Witnesses:

D. T. LYONS, GEORGE R. W. KITTSON.

